uBlock has much the same effect. Requests err in the console with "ERR_BLOCKED_B... | Hacker News

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		stephengillie on March 21, 2018 \| parent \| context \| favorite \| on: Blocklist Facebook domains uBlock has much the same effect. Requests err in the console with "ERR_BLOCKED_BY_CLIENT" instead of a 404, so technically it is possible to detect this with a first-party JavaScript file.

0xfeba on March 21, 2018 [–]

That's how the "please don't use an ad-blocker" stuff works.

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